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0.2x-0.4=0.8
We move all terms to the left:
0.2x-0.4-(0.8)=0
We add all the numbers together, and all the variables
0.2x-1.2=0
We move all terms containing x to the left, all other terms to the right
0.2x=1.2
x=1.2/0.2
x=5+0.2/0.2
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